.main-header {
  background-color: rgba(255, 255, 255, 0.95);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(2, 132, 199, 0.15);
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 5%;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.logo {
  font-size: 2.2rem;
  font-weight: bold;
  letter-spacing: 1px;
  background: linear-gradient(90deg, var(--accent-color), var(--accent-hover));
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  transition: letter-spacing var(--transition-speed);
}

.logo:hover {
  letter-spacing: 3px;
}

.menu-toggle {
  display: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--accent-color);
  user-select: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  position: relative;
  color: var(--text-main);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-speed);
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-color), var(--accent-hover));
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-speed);
}

.nav-links a:hover {
  color: var(--accent-color);
}

.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}